ConTrawl: trawl gear monitoring system.

ConTrawl is a complete system for the data acquisition, post-processing and analysis of the main trawl gear parameters. The main measured parameters are: vessel speed relative to the seabed measured by Atlas Doppler log; RPM; shaft torque; shaft power; and fuel consumption of the main vessel engine. Gear parameters include warp loads; horizontal door spread; door pitch and roll angles; horizontal net open-ing; vertical net opening and clearance; depth, temperature, pitch and roll at the headline centre; trawl speed sensor (longitudinal, transversal speeds); tensions exerted by the warp and by the backstrops at the attachment points of the door; ten-sions ahead of the net wing tips.